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From: Stephan T. Lavavej (stl_at_[hidden])
Date: 2019-07-19 18:04:33

Nope! Sometimes you can get away with it.


-----Original Message-----
From: Olaf van der Spek <ml_at_[hidden]>
Sent: Friday, July 19, 2019 2:55 AM
To: boost <boost_at_[hidden]>
Cc: Stephan T. Lavavej <stl_at_[hidden]>
Subject: Re: [boost] MSVC 2019

On Tue, Jul 16, 2019 at 12:01 AM Stephan T. Lavavej via Boost <boost_at_[hidden]> wrote:
> There's a potential issue with doing that. Binary compatibility between the 2015, 2017, and 2019 toolsets comes with a couple of restrictions: no LTCG (which is a non-issue here), and the final link must be performed by a toolset that's as new as (or newer than) all of the object files and libraries being linked. For example, you can't take VS 2019 16.1 (v142) compiled libraries, and perform a final link with VS 2015 RTM (v140). And in practice, I am aware of at least one build break that can be encountered when attempting this (as we added a vectorized implementation of std::reverse that requires separately compiled support to be dragged in during the final link).

Isn't this (no forward compatibility) detected and enforced by the linker?


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